The Goldbeard family is a pre-made family that came with Barnacle Bay from The Sims 3 store. Their last name may be a play on the famous pirate Blackbeard. They have a feud with the Inkbeard family, and while the reason is not explicitly stated, the Inkbeard family bio reads that their family history includes "rumors of fabulous wealth plundered and lost", perhaps alluding to the Goldbeards having been the ones to have recovered the treasure, starting the feud.
They are the wealthiest family in Barnacle Bay, as stated in their family biography with §150,000 in family funds, plus a large and expensive 5Br 4Ba mansion.
Goldbeard: May be referring to the famous pirate Blackbeard.